GENERAL KNOWLEDGE

Detailed explanation-1: -The periodic table is not simply a grid of elements arranged numerically. In the periodic table, the elements are arranged in horizontal rows called periods (numbered in blue) and vertically into columns called groups. These groups are numbered by two, somewhat conflicting, schemes.

Detailed explanation-2: -The periodic table is organized into groups (vertical columns), periods (horizontal rows), and families (groups of elements that are similar).

Detailed explanation-3: -The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.